Student Apple Music plans.

If you already have an active Apple Music subscription, find the subscription on your Apple ID, and select the Student option. You will be asked to verify your student email address from a participating college with UniDays.

link-> Change your subscription from Apple - Apple Support

link-> Join Apple Music on your iPhone, iPad, iPod touch, Mac, or PC - Apple Support

Then follow the steps in the second link I provided to start the subscription. You can select the Student option during the setup process.

Just open the Music App on an iPhone, iPad, iPod touch or Mac and the option to subscribe will be presented to you under the Browse or For you sections.